Add response with error message on failure destroy action

backend/app/controllers/spree/admin/resource_controller.rb

@@ -108,6 +108,7 @@ def destroy
  invoke_callbacks(:destroy, :fails)
  respond_with(@object) do |format|
  format.html { redirect_to location_after_destroy }
+ format.js { render status: :unprocessable_entity, plain: @object.errors.full_messages.join(', ') }
  end
  end
  end

backend/spec/controllers/spree/admin/resource_controller_spec.rb

@@ -32,6 +32,13 @@ def model_class
  model do
  acts_as_list
  validates :name, presence: true
+ before_destroy :check_destroy_constraints
+
+ def check_destroy_constraints
+ return unless name == 'undestroyable'
+ errors.add :base, "You can't destroy undestroyable things!"
+ throw(:abort)
+ end
  end
  end
 
@@ -146,6 +153,21 @@ def model_class
  it 'destroys the resource' do
  expect { subject }.to change { Widget.count }.from(1).to(0)
  end
+
+ context 'failure' do
+ let(:widget) { Widget.create!(name: 'undestroyable') }
+ let(:params) { { id: widget.id } }
+
+ context 'js format' do
+ subject { delete :destroy, params: params, format: 'js' }
+
+ it 'responds with error message' do
+ subject
+ expect(response).to be_unprocessable
+ expect(response.body).to eq assigns(:widget).errors.full_messages.join(', ')
+ end
+ end
+ end
  end
 
  describe '#update_positions' do